We have proposed a model in which a Proca-Wentzel (PW) field consisting of \(\sim \)  MeV–multi-GeV mass particles are mediators of secluded fermionic DM interactions. From the low-energy phenomenology it is known that electroweak precision data such as the mass of \(W\)  boson, the decay width of \(Z\)  boson, and some asymmetries, can constrain such a model. For our secluded DM model, the constraints on \(\xi /\sqrt{|1-M_{Z}^{\prime 2}/M_{Z}^{2}|}\) , where \(\xi =g_{VB}/\sqrt{1-g^2_{VB}}\) , are well satisfied. Indeed, they are much smaller than \({\cal {O}}(10^{-2})\)  [1]}. Also, the mediator of DM interactions will not induce flavor-changing neutral current processes.
